PCE workgroup Fangwei Hu
Internet-Draft Quan Xiong
Intended status: Standards Track Greg Mirsky
Expires: June 13, 2019 ZTE Corporation
Weiqiang Cheng
China Mobile
Dec 10, 2018
Stitching LSP Association
draft-hu-pce-stitching-lsp-association-00.txt
Abstract
This document defines the stitching LSP association type and
stitching LSP association TLV for the inter-domain Segment Routing
MPLS-TP network.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions used in this document . . . . . . . . . . . . . . 2
2.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 2
2.2. Requirements Language . . . . . . . . . . . . . . . . . . 2
3. Operation Overview . . . . . . . . . . . . . . . . . . . . . 3
4. Stitching LSP Association Group . . . . . . . . . . . . . . . 3
4.1. Stitching LSP Association Object . . . . . . . . . . . . 3
4.2. Stitching TLV format . . . . . . . . . . . . . . . . . . 3
5. Security Considerations . . . . . . . . . . . . . . . . . . . 4
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
7.1. Association Types . . . . . . . . . . . . . . . . . . . . 4
7.2. Stitching Association TLV . . . . . . . . . . . . . . . . 4
8. Normative References . . . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
[I-D.hu-mpls-sr-inter-domain-use-cases] provides stitching path label
to indicate the the packet from the border nodes to forward to
another AS domain. The border nodes should install the following
MPLS data entries:
incomging label: Stiching Path Label
outgoing label: the SID list of the next AS domain + next Stitching Path label
[I-D.xiong-pce-stateful-pce-sr-inter-domain] introduces the procedure
and the PCEP extension to form the inter-domain MPLS-TP MPLS data
entries. This document proposes the related LSP association group
extension.
2. Conventions used in this document
2.1. Terminology
2.2. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
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3. Operation Overview
[I-D.ietf-pce-association-group] introduces a generic mechanism to
create a grouping of LSPs. This grouping can then be used to define
associations between sets of LSPs or between a set of LSPs and a set
of attributes. This document proposes a new optional association
object type called "stitching Association LSP type" and the related
TLV called "stitching association LSP TLV" to form the inter-domain
MPLS forwarding entry for the border nodes.
As defined in [I-D.ietf-pce-association-group], stitching LSP
Association could be created dynamically or configured by the
operator when operator-configured association is needed.
4. Stitching LSP Association Group
4.1. Stitching LSP Association Object
A new Association Type for the Association Object is defined in this
document,
Association Type (TBD) = Stitching Path Segment LSP Association
Group.
The Association Types is operator-configured associations in nature
and statically created by the operator on the PCEP peers. The LSP
belonging to these associations is conveyed via PCEP messages to the
PCEP peer. Operator-configured Association Range TLV
[I-D.ietf-pce-association-group] MUST NOT be sent for this
Association Type, and MUST be ignored, so that the entire range of
association ID can be used for it.
The Association ID, Association Source, optional Global Association
Source and optional Extended Association ID in the Stitching Path
Segment LSP Association Group Object are initialized using the
procedures defined in [I-D.ietf-pce-association-group] and [RFC7551].
4.2. Stitching TLV format
The format of the Stitching LSP Association Group TLV is shown in
Figure 1.
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: Stitching LSP Association Group TLV
The fields of the Stitching LSP Association Group TLV are following:
Type:16bits, it indicates the stitching LSP Association Group
TLV(TBD2, the value is assigned by IANA).
Length: the value is 4, it indicates the length of the TLV is 4
bytes.
Reserved: it is reserved for future use.
5. Security Considerations
6. Acknowledgements
7. IANA Considerations
7.1. Association Types
IANA is requested to make the assignment of values for the sub-
registry "ASSOCIATION Type Field" as follows:
+--------+------------------+
| Value | Reference |
+--------+------------------+
| TBD1 | [this document] |
+--------+------------------+
Table 1
7.2. Stitching Association TLV
This document defines a new TLV for carrying additional information
of LSPs within a Stitching LSP Association Group. IANA is requested
to add the assignment of a new value in the existing "PCEP TLV Type
Indicators" registry as follows:
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+-------+-------------------------------------+------------------+
| Type | Description | Reference |
+-------+-------------------------------------+------------------+
| TBD2 | Stitching LSP Association Group TLV | [this document] |
+-------+-------------------------------------+------------------+
Table 2
8. Normative References
[I-D.cheng-spring-mpls-path-segment]
Cheng, W., Wang, L., Li, H., Chen, M., Gandhi, R., Zigler,
R., and S. Zhan, "Path Segment in MPLS Based Segment
Routing Network", draft-cheng-spring-mpls-path-segment-03
(work in progress), October 2018.
[I-D.hu-mpls-sr-inter-domain-use-cases]
hu, f., Xiong, Q., Mirsky, G., and W. Cheng, "Segment
Routing in MPLS-TP Inter-domain Use Cases", draft-hu-mpls-
sr-inter-domain-use-cases-00 (work in progress), December
2018.
[I-D.ietf-pce-association-group]
Minei, I., Crabbe, E., Sivabalan, S., Ananthakrishnan, H.,
Dhody, D., and Y. Tanaka, "PCEP Extensions for
Establishing Relationships Between Sets of LSPs", draft-
ietf-pce-association-group-06 (work in progress), June
2018.
[I-D.xiong-pce-stateful-pce-sr-inter-domain]
Xiong, Q., hu, f., Mirsky, G., and W. Cheng, "Stateful PCE
for SR-MPLS-TP Inter-domain", draft-xiong-pce-stateful-
pce-sr-inter-domain-00 (work in progress), December 2018.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC7551] Zhang, F., Ed., Jing, R., and R. Gandhi, Ed., "RSVP-TE
Extensions for Associated Bidirectional Label Switched
Paths (LSPs)", RFC 7551, DOI 10.17487/RFC7551, May 2015,
<https://www.rfc-editor.org/info/rfc7551>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
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Authors' Addresses
Fangwei Hu
ZTE Corporation
No.889 Bibo Rd
Shanghai 201203
China
Phone: +86 21 68896273
Email: hu.fangwei@zte.com.cn
Quan Xiong
ZTE Corporation
No.6 Huashi Park Rd
Wuhan, Hubei 430223
China
Phone: +86 27 83531060
Email: xiong.quan@zte.com.cn
Greg Mirsky
ZTE Corporation
USA
Email: gregimirsky@gmail.com
Weiqiang Cheng
China Mobile
Beijing
China
Email: chengweiqiang@chinamobile.com
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